COMET H5424 – CO₂ Sensor with 2 Relays

COMET H5424 CO₂ Controller 2 Relays RS485 

The COMET H5424 is a reliable CO₂ concentration controller with direct control function: it precisely measures the carbon dioxide concentration from 0 to 5000 ppm and automatically switches two powerful relays when limits are exceeded – e.g. for ventilation, air conditioning, window openers, or alarm sirens. In addition, a 3-color LED traffic light (green/yellow/red) and a loud acoustic signal immediately warn of poor air quality.

Perfect for all rooms with variable occupancy: schools, kindergartens, offices, conference rooms, sports halls, restaurants, or production areas – the H5424 automatically ensures fresh air while saving up to 50% energy through demand-controlled ventilation.

The RS485 interface with Modbus RTU protocol (and Advantech ADAM compatible) integrates the H5424 seamlessly into any building automation, BMS, or SCADA system. The maintenance-free NDIR CO₂ sensor with automatic calibration guarantees years of precise operation without readjustment.

Rugged housing, simple wall mounting, and a 3-year warranty – the H5424 is the smart solution for healthy indoor air and energy-efficient ventilation.

Why the COMET H5424 is the ideal CO₂ control solution:

• Precise NDIR CO₂ sensor 0–5000 ppm (±50 ppm + 3%)
• 2 potential-free relays (2 A / 50 V / 60 VA) – direct ventilation control
• 3-color LED traffic light – instantly visible air quality
• Integrated acoustic alarm – switchable
• RS485 Modbus RTU – perfect for building automation
• Maintenance-free thanks to automatic calibration
• Optionally expandable up to 10,000 ppm (for an extra charge)
• Rugged housing –30 to +60 °C operating temperature
• Easy wall mounting
• 3-year warranty

Technical data:

• CO₂ measuring range: 0 to 5000 ppm
• CO₂ accuracy: ±(50 ppm + 3% of measured value) at 25 °C and 1013 hPa
• CO₂ resolution: 1 ppm
• Relay outputs: 2 × potential-free, max. 50 V / 2 A / 60 VA
• LED indicator: Green ≤1000 ppm | Yellow 1001–1200 ppm | Red ≥1201 ppm
• Acoustic alarm: built-in beeper, switchable
• Communication: RS485, Modbus RTU, Advantech ADAM
• Power supply: 9–30 V DC
• Operating temperature: –30 to +60 °C
• Protection class: IP30
• Dimensions: 136 × 150 × 45 mm
• Warranty: 3 years

Perfectly suited for:

• Schools, kindergartens, lecture halls
• Offices, open-plan offices, call centers
• Conference and meeting rooms
• Sports halls, fitness studios
• Restaurants, canteens, gastronomy
• Production and storage halls
• Hospitals, waiting rooms
• Demand-controlled ventilation according to current standards

Installation & commissioning – simple as can be

Wall mounting with two screws, connect relays and power supply, optionally connect RS485 – done. Switching points, hysteresis, and alarm delay can be conveniently set via the free TSensor software or directly on the device.

Summary:

• CO₂ level transmitter with two output relays
• Green LED on – CO₂ concentration 0 to 1000 ppm
• Yellow LED on – CO₂ concentration 1001 to 1200 ppm
• Red LED on – CO₂ concentration 1201 ppm and higher

Scope of delivery:

• H5424
• User manual
• Traceable calibration certificate
• Free TSensor software for transmitter configuration